Intermediate connection and switching device for heating devices



Sept. 2 1924.

B. ROSENBAUM INTERMEDIATE CONNECTION AND SWITCHING DEVICE FOR HEATING DEVICES Filed Sept. 1921 Fig.1

Patented Sept. 2, 1924.

BRUNO ROSENBAUM.

0F BERLIN, GERMANY.

INTERMEDIATE CONNECTION AND SWITCHING DEVICE FOR HEATING DEVICES.

Application filed September 2, 1921.

To all whom it may concern.

Be it known that I, BRUNO ROSENBAUM. a subject of the German Republic, residing at Berlin, Germany, have invented certain new and useful Improvements in Intermediate Connection and Switching Devices for Heating Devices (for which I have filed applications in Germany Apr. 10, 1916, Patent No. 302,464; Sweden Dec. 30, 1919, No. 6,008; Denmark Feb. 18, 1920, No. 5041-; Poland July 2, 1920, No. 9,766; and Austria Feb. 26, 1918, Patent No. 80,193), of which the following is a specification.

In electrical systems, more particularly radio telegraph outfits, it frequently is necessary to supplement various parts or to add units not originally provided for. Thus it may become necessary in the case of a wireless station in an aeroplane to connect up an electrical heating element subsequent to the installation of the radio apparatus. A. similar emergency may arise in stationary radio sending sets, for instance, a special kind of transmitter may be substituted for another type and the entire apparatus operated at will with either one or the other transmitter.

It has. been found that for reasons of organization it is not feasible, particularly in the case of military equipment, to return the apparatus to the place of manufacture for the necessary changes. On the other hand, the mechanics which are available on the field seldom are sufiiciently skilled to make the necessary changes in the apparatus.

This invention has for its object the pro vision of apparatus to enable changes to be rapidly and easily made by persons unskilled in the technicalities of the particular apparatus. According to the invention this is obtained in a very simple manner by placing in the circuits connector plugs of the pin and socket type, the pins of which are suitably arranged to prevent wrong connections from being made. Another pin and socket unit is provided to which may be connected the supplementary apparatus such as an electric heater, and this pin plug is arranged so that it may be inserted between the two halves of the plug originally provided.

Where radio transmitting apparatus is in use and it is desired to utilize the power supply during certain periods for heating purposes, it is necessary to provide a switching arrangement for changing over from radio transmitter to electrical heater. Inas- Serial No. 488,180.

much as the transmitter key is in the power supply circuit, it has been found desirable to provide a switch mechanism adjacent to the transmitting key so that the switch will coact with the key in various positions. In one position the switch may serve to connect the power supply to the radio transmitter and in this position the key is fully operable. In a second position the switch opens all the circuits, thereby cutting off both the heater and the radio transmitter. In the third position, however, the switch may connect the power supply to a heater, and it is necessary that in this position the switch engage the transmitter key so as to render it inaccessible.

In order to illustrate more clearly the nature of this invention, a preferred embodiment has been illustrated in the accompanying drawings, which are to be taken in conjunction with the following description. In these drawings,

Fig. 1 illustrates diagrammatically an installation comprising a radio transmitter, a heater element and a combined switch mech anism and transmitter key;

Fig. 2 is a view of the combined switch and transmitter key showing the switch in the position for supplying energy to the heater;

Fig. 3 is a modification of the switch mechanism shown in Fig. 2;

Fig. 41 illustrates the switch mechanism of Fig; 2 in the position for supplying current to the radio transmitter.

Fig. 5 is a schematic wiring diagram of the system.

Referring now to the figure, a radio transmitting outfit is represented by the box 2 and a heater element is represented by the box 1. Power may be supplied from any convenient source to both of these elements through the pin plugs 1 and The two halves of the plug 1 are adapted to be inserted in one another when the radio transmitter is to be used alone, and the pin plug 3 is so designed that it may be inserted between the two halves of the pin plug 1 to permit the use of a heater element 4.

When the heater element at is in use it becomes necessary to provide means for changing from the radio transmitter to the heater element, and this is accomplished by means of a switch mechanism 5, which is conveniently located on top of the transmitter key container 6. The switch 7 preferably has'three. positions, the position illustrated in Fig, 1 being the neutral position, in which the power supply circuit is cut oil from both the heater element 41- and the radio transmitter 2. In Fig. 4 the switchis show-nin/the position for supply ing power to the radio transmitter, and in this position of the switch the transmitter key 8 is fully operable. However, when the swltchis in the position shown in Fig. 2 whereby energy is supplied to the heater instead of to the radio transmitter, the transmitter key 8- is rendered inaccessible. It-maybe rendered inaccessible in numerous ways, the method shown being preferable. As illustrated, the switch lever 7. is brought down so as to positively engage the transmitting key 8't0 prevent any motion of it. In;F-i'=g 5- a schematic wiring diagram is shown-,'the switch mechanism being illustrat'ed at 5. The alternating current leads are represented by heavy; lines. One side of the-power leads goes directly through the plug-connections to the radio transmitter, and a branch goes through the electric heater; The other side of the power line goes tlrroughth'e lines 1101" the lower switch 13,

thence. through the'pin plug connections and either upper switch 1301 switch 1 1, as the case may "be, If the switch 13 is closed, the current will pass through the heater element and not through the transmitter,

whereasif-{switch 14 is closed and 13 is open,

the current will pass through the radio transmitter 2. In this position of the switches-Hickey 8 is-operab'le and serves to make and break the power supply circuit.

This inventionis notzto be limited in its spirit or scope by the preferred embodiment disclosed herein, as it will at once be apparent to those skilled in the art that various other forms of apparatus may be vcontrolled by means of the method andtapparatus herein disclosed.

I claim:

1. In a combined radio transmitting and heater system comprising a radio transmitter, a transmitter key, an electrical heater, and a source of electrical energy, means for interrupting the energy supplied to the radio transmitter, and means for simultaneously transferring the power from the wireless transmitter to the heater and rendering said transmitter key inaccessible.

2. In a combined radio transmitting and heater system comprising a radio transmit.- ter, a transmitter key, an electrical heater, and a source of electrical energy, a control switch in circuit with said source of electrical-energy and electric heater forcontrolling the current flow to said heater, and means whereby said transmitter key isrendered inaccessible and the transmitting circuit is open when said switch is in the position for supplying energy to said heater.

3. In a combined radio transmitting and heater system comprising a radio transmitter, a transmitter key,.an electrical heater,

and a source of electrical'energy, a switch in'circuit with said source of electrical enpower to said heater, a second position tor'openmg all circuits, and a thlrdpositlOII tor supplying energy to sand heater,

means whereby said switch engages said transmitter lzey and renders it inaccessible 70 ergy having one position for supplying 

